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Derivative of φ with respect to the dimensionless density δ

Values for calculation

n
δ
I
τ
J
\text{Region}

Calculation

Derivative of φ with respect to the dimensionless density δ

\text{if }\ \text{Region}= 3
φ_δ=n[1]\cdot δ^{-1}+\sum_{i=2}^{40}{n[i]\cdot I[i]\cdot δ^{I[i]-1}\cdot τ^{J[i]}}
\text{else}
φ_δ=0